iiinova — where your digital self keeps evolving

Second Nature Systems @showpiece.bsky.social · 12/10/2026

Spark Gap comparison of electricity tariffs against Tracker gas reference Octopus Tracker April 2026 v1; counterfactual using published Octopus rates and latest Fixed gas reference Octopus 12M Fixed September 2026 v2; Octopus 12M Fixed October 2026 v1; Octopus 12M Fixed October 2026 v2; Octopus 12M Fixed October 2026 v3; Octopus 12M Fixed October 2026 v4; Octopus 12M Fixed; published Octopus rates; day-matched counterfactual.

Energy-only raw cost per useful kWh of delivered heat for selected heat-pump electricity tariffs and a modeled boiler without Solar-DHW using household gas tariff Octopus 12M Fixed May 2026 v2; recorded rate, configured identity, Tracker gas reference Octopus Tracker April 2026 v1; counterfactual using published Octopus rates, and latest Fixed gas reference Octopus 12M Fixed September 2026 v2; Octopus 12M Fixed October 2026 v1; Octopus 12M Fixed October 2026 v2; Octopus 12M Fixed October 2026 v3; Octopus 12M Fixed October 2026 v4; Octopus 12M Fixed; published Octopus rates; day-matched counterfactual. Delivered heat was 209 kWh for the heat-pump household and 69 kWh for the modeled no-Solar-DHW boiler, a 3.04 times higher-to-lower ratio. Demand-adjusted companion rows apply only to the lower-heat boiler tariffs and show actual period spend divided by the higher-heat heat-pump household's heat, a common-denominator cost-burden index rather than a physical tariff unit cost. The observed household difference does not show that heating technology caused the demand difference.

000

Second Nature Systems @showpiece.bsky.social · 12/10/2026

Heat Pump IDs compared to the Boiler today: 473

100

Second Nature Systems @showpiece.bsky.social · 12/10/2026

Cost, Energy & Comfort [18 Days | 24 Sep–11 Oct 26] HP £1.65 cheaper than modeled boiler without off-grid solar+battery DHW HP — Intelligent Flux - £11.15 use + £7.85 elec SC = £19.00 Boiler — Fixed + Agile elec - £6.64 gas + £5.28 gas SC + £8.74 elec SC = £20.65

Heat-pump and boiler cost comparison with over-time charts, bill-relevant cost comparison, tariff ranking and COP diagnostics

Energy and comfort comparison for Boiler with off-grid solar+battery DHW — observed and Boiler without off-grid solar+battery DHW — modeled

Operational carbon comparison for the heat pump, Boiler without off-grid solar+battery DHW — modeled, and Boiler with off-grid solar+battery DHW — observed, with daily heat-pump and modeled-boiler operational emissions

100

Second Nature Systems @showpiece.bsky.social · 11/10/2026

000

Second Nature Systems @showpiece.bsky.social · 11/10/2026

Heat Pump IDs compared to the Boiler today: 473

100

Second Nature Systems @showpiece.bsky.social · 11/10/2026

Cost, Energy & Comfort [15 Days | 26 Sep–10 Oct 26] HP £2.07 cheaper than modeled boiler without off-grid solar+battery DHW HP — Intelligent Flux - £8.86 use + £6.53 elec SC = £15.38 Boiler — Fixed + Agile elec - £5.79 gas + £4.40 gas SC + £7.26 elec SC = £17.45

100

Second Nature Systems @showpiece.bsky.social · 11/10/2026

Solar hot water: [189 Days | 5 Apr 26 to 10 Oct 26] 10 Oct: 11.14 kWh; since 5 Apr 492.4 kWh into tank. Modeled boiler gas input ~714.0 kWh; net input saved ~221.6 kWh. Modeled CO₂e avoided: ~3.17 kg on 10 Oct; ~139.9 kg since 5 Apr. ~31% less input, ~1.45x vs boiler model.

Solar hot water chart showing immersion input for the completed day, cumulative input since 5 April, modeled gas input, net input saved versus immersion, modeled CO2e avoided, input efficiency, and an off-grid garage solar surplus note explaining hot water use instead of curtailment.

000

Second Nature Systems @showpiece.bsky.social · 10/10/2026

000

Second Nature Systems @showpiece.bsky.social · 10/10/2026

Heat Pump IDs compared to the Boiler today: 473

100

Second Nature Systems @showpiece.bsky.social · 10/10/2026

Cost, Energy & Comfort [12 Days | 28 Sep–9 Oct 26] HP £1.45 cheaper than modeled boiler without off-grid solar+battery DHW HP — Intelligent Flux - £6.24 use + £5.20 elec SC = £11.44 Boiler — Fixed + Agile elec - £3.58 gas + £3.52 gas SC + £5.78 elec SC = £12.89

100

Second Nature Systems @showpiece.bsky.social · 10/10/2026

Solar hot water: [188 Days | 5 Apr 26 to 9 Oct 26] 9 Oct: 1.89 kWh; since 5 Apr 481.2 kWh into tank. Modeled boiler gas input ~697.8 kWh; net input saved ~216.6 kWh. Modeled CO₂e avoided: ~0.54 kg on 9 Oct; ~136.8 kg since 5 Apr. ~31% less input, ~1.45x vs boiler model.

000

Second Nature Systems @showpiece.bsky.social · 09/10/2026

1 panel and 1 inverter for £540? 🫣doesn't seem like a good deal I got 6 panels + 3 inverters for £790

000

Second Nature Systems @showpiece.bsky.social · 09/10/2026

Send them an email, they should be able to provide additional options :)

010

Second Nature Systems @showpiece.bsky.social · 09/10/2026

000

Second Nature Systems @showpiece.bsky.social · 09/10/2026

Heat Pump IDs compared to the Boiler today: 473

100

Second Nature Systems @showpiece.bsky.social · 09/10/2026

Cost, Energy & Comfort [9 Days | 30 Sep–8 Oct 26] HP £1.27 cheaper than modeled boiler without off-grid solar+battery DHW HP — Intelligent Flux - £4.59 use + £3.87 elec SC = £8.46 Boiler — Fixed + Agile elec - £2.78 gas + £2.64 gas SC + £4.31 elec SC = £9.73

100

Second Nature Systems @showpiece.bsky.social · 08/10/2026

000

Second Nature Systems @showpiece.bsky.social · 08/10/2026

Heat Pump IDs compared to the Boiler today: 473

100

Second Nature Systems @showpiece.bsky.social · 08/10/2026

Cost, Energy & Comfort [6 Days | 2 Oct–7 Oct 26] HP £1.50 cheaper than modeled boiler without off-grid solar+battery DHW HP — Intelligent Flux - £2.47 use + £2.57 elec SC = £5.03 Boiler — Fixed + Agile elec - £1.92 gas + £1.76 gas SC + £2.86 elec SC = £6.53

100

Second Nature Systems @showpiece.bsky.social · 08/10/2026

Also electrical back up heater with I now use a lot because of solar and battery. Ability to choose what top card values are displaying (max two rows). Ability to choose what line series are displayed 🥰💚

010

Second Nature Systems @showpiece.bsky.social · 08/10/2026

Thanks, the wish list is quite long and might be complex 😅 But… I have HA sensor with a real time heat loss value, which would be nice to display. Also, average line for heat output power (would work and show nicely when system cycles to match heat loss)

110

Second Nature Systems @showpiece.bsky.social · 08/10/2026

Nice work @trystanlea.bsky.social @glynhudson.bsky.social on emoncms UI! And not forgetting about the last few boilers on it 🥳💚

150

Second Nature Systems @showpiece.bsky.social · 06/10/2026

000

Second Nature Systems @showpiece.bsky.social · 06/10/2026

Heat Pump IDs compared to the Boiler today: 473

100

Second Nature Systems @showpiece.bsky.social · 06/10/2026

Cost, Energy & Comfort [3 Days | 3 Oct–5 Oct 26] HP £0.67 cheaper than modeled boiler without off-grid solar+battery DHW HP — Intelligent Flux - £1.29 use + £1.28 elec SC = £2.57 Boiler — Fixed + Agile elec - £0.93 gas + £0.88 gas SC + £1.43 elec SC = £3.24

100

Second Nature Systems @showpiece.bsky.social · 05/10/2026

Spark Gap comparison of electricity tariffs against Tracker gas reference recorded historical Tracker rates followed by Octopus Tracker April 2026 v1; exact historical product identity unavailable; later rates published by Octopus and latest Fixed gas reference Octopus 12M Fixed May 2025 v2; Octopus 12M Fixed June 2025 v1; Octopus 12M Fixed July 2025 v1; Octopus 12M Fixed July 2025 v2; Octopus 12M Fixed July 2025 v4; Octopus 12M Fixed July 2025 v6; Octopus 12M Fixed July 2025 v7; Octopus 12M Fixed July 2025 v5; Octopus 12M Fixed August 2025 v2; Octopus 12M Fixed August 2025 v3; Octopus 12M Fixed August 2025 v1; Octopus 12M Fixed August 2025 v6; Octopus 12M Fixed September 2025 v1; Octopus 12M Fixed September 2025 v2; Octopus 12M Fixed September 2025 v3; Octopus 12M Fixed October 2025 v1; Octopus 12M Fixed October 2025 v2; Octopus 12M Fixed November 2025 v1; Octopus 12M Fixed November 2025 v3; Octopus 12M Fixed November 2025 v2; Octopus 12M Fixed January 2026 v1; Octopus 12M Fixed February 2026 v1; Octopus 12M Fixed February 2026 v2; Octopus 12M Fixed February 2026 v3; Octopus 12M Fixed February 2026 v4; Octopus 12M Fixed February 2026 v5; Octopus 12M Fixed February 2026 v6; Octopus 12M Fixed February 2026 v7; Octopus 12M Fixed March 2026 v2; Octopus 12M Fixed March 2026 v3; Octopus 12M Fixed March 2026 v4; Octopus 12M Fixed April 2026 v1; Octopus 12M Fixed April 2026 v2; Octopus 12M Fixed April 2026 v3; Octopus 12M Fixed May 2026 v2; Octopus 12M Fixed May 2026 v1; Octopus 12M Fixed June 2026 v1; Octopus 12M Fixed June 2026 v2; Octopus 12M Fixed June 2026 v3; Octopus 12M Fixed June 2026 v4; Octopus 12M Fixed June 2026 v5; Octopus 12M Fixed June 2026 v7; Octopus 12M Fixed June 2026 v8; Octopus 12M Fixed July 2026 v1; Octopus 12M Fixed Low Standing Charge July 2026 v1; Octopus 12M Fixed Low Standing Charge July 2026 v2; Octopus 12M Fixed Low Standing Charge July 2026 v3; Octopus 12M Fixed Low Standing Charge July 2026 v4; Octopus 12M Fixed Low Standing Charge July 2026 v5; Octopus 12M Fixed Low Standing Charge August 2026 v1; Octopus 12M Fixed Low Standing Charge August 2026 v2; Octopus 12M Fixed Low Standing Charge August 2026 v3; Octopus 12M Fixed Low Standing Charge August 2026 v4; Octopus 12M Fixed Low Standing Charge August 2026 v5; Octopus 12M Fixed August 2026 v6; Octopus 12M Fixed September 2026 v1; Octopus 12M Fixed September 2026 v2; Octopus 12M Fixed; Octopus 12M Fixed Low SC; Octopus 12M Fixed Low Standing Charge; published Octopus rates; day-matched counterfactual Gap-filled reference dates: 2025-08-01, 2025-08-02, 2025-08-03, 2025-08-04, 2025-08-05, 2026-03-14, 2026-03-15, 2026-03-16, 2026-03-17, 2026-03-18, 2026-03-19, 2026-03-20, 2026-03-21, 2026-03-22, 2026-03-23, 2026-03-24, 2026-03-25, 2026-03-26, 2026-03-27, 2026-03-28, 2026-03-29, 2026-03-30, 2026-03-31, 2026-04-01, 2026-04-02, 2026-04-03, 2026-04-04, 2026-04-05, 2026-04-06, 2026-04-07.

000

Second Nature Systems @showpiece.bsky.social · 05/10/2026

Heat Pump IDs compared to the Boiler today: 213

100

Second Nature Systems @showpiece.bsky.social · 05/10/2026

Cost, Energy & Comfort [894 Days | 24 Apr 24–4 Oct 26] Modeled boiler without off-grid solar+battery DHW £143.12 cheaper than HP HP — Agile - £1877.39 use + £445.37 elec SC = £2322.77 Boiler — Tracker → Fixed + Tracker→Agile elec - £1352.06 gas + £256.97 gas SC + £570.61 elec SC = £2179.64

100

Second Nature Systems @showpiece.bsky.social · 05/10/2026

Solar hot water: [183 Days | 5 Apr 26 to 4 Oct 26] 4 Oct: 5.72 kWh; since 5 Apr 479.4 kWh into tank. Modeled boiler gas input ~695.1 kWh; net input saved ~215.7 kWh. Modeled CO₂e avoided: ~1.63 kg on 4 Oct; ~136.2 kg since 5 Apr. ~31% less input, ~1.45x vs boiler model.

000

Second Nature Systems @showpiece.bsky.social · 04/10/2026

010

Second Nature Systems @showpiece.bsky.social · 04/10/2026

Heat Pump IDs compared to the Boiler today: 473

100

Second Nature Systems @showpiece.bsky.social · 04/10/2026

[Rewind | 30 Days | 1 Sep–30 Sep 26] HP £10.89 cheaper than modeled boiler without off-grid solar+battery DHW HP — Intelligent Flux - £11.45 use + £13.48 elec SC = £24.93 Boiler — Fixed + Agile elec - £12.03 gas + £8.80 gas SC + £15.00 elec SC = £35.83

100

Second Nature Systems @showpiece.bsky.social · 03/10/2026

000

Second Nature Systems @showpiece.bsky.social · 03/10/2026

Heat Pump IDs compared to the Boiler today: 473

100

Second Nature Systems @showpiece.bsky.social · 03/10/2026

Cost, Energy & Comfort [365 Days | 3 Oct 25–2 Oct 26] HP £256.82 cheaper than modeled boiler without off-grid solar+battery DHW HP — Agile - £449.61 use + £182.39 elec SC = £632.00 Boiler — Tracker → Fixed + Tracker→Agile elec - £554.54 gas + £108.26 gas SC + £226.03 elec SC = £888.82

100

Second Nature Systems @showpiece.bsky.social · 03/10/2026

Solar hot water: [181 Days | 5 Apr 26 to 2 Oct 26] 2 Oct: 3.10 kWh; since 5 Apr 473.6 kWh into tank. Modeled boiler gas input ~686.8 kWh; net input saved ~213.1 kWh. Modeled CO₂e avoided: ~0.88 kg on 2 Oct; ~134.6 kg since 5 Apr. ~31% less input, ~1.45x vs boiler model.

000

Second Nature Systems @showpiece.bsky.social · 02/10/2026

000

Second Nature Systems @showpiece.bsky.social · 02/10/2026

Heat Pump IDs compared to the Boiler today: 473

100

Second Nature Systems @showpiece.bsky.social · 02/10/2026

Cost, Energy & Comfort [30 Days | 1 Sep–30 Sep 26] HP £10.89 cheaper than modeled boiler without off-grid solar+battery DHW HP — Intelligent Flux - £11.45 use + £13.48 elec SC = £24.93 Boiler — Fixed + Agile elec - £12.03 gas + £8.80 gas SC + £15.00 elec SC = £35.83

100

Second Nature Systems @showpiece.bsky.social · 02/10/2026

Solar hot water: [180 Days | 5 Apr 26 to 1 Oct 26] 1 Oct: 0.94 kWh; since 5 Apr 470.5 kWh into tank. Modeled boiler gas input ~682.3 kWh; net input saved ~211.7 kWh. Modeled CO₂e avoided: ~0.27 kg on 1 Oct; ~133.7 kg since 5 Apr. ~31% less input, ~1.45x vs boiler model.

000

Second Nature Systems @showpiece.bsky.social · 01/10/2026

000

Second Nature Systems @showpiece.bsky.social · 01/10/2026

Heat Pump IDs compared to the Boiler today: 473

100

Second Nature Systems @showpiece.bsky.social · 01/10/2026

Cost, Energy & Comfort [92 Days | 1 Jul–30 Sep 26] HP £25.73 cheaper than modeled boiler without off-grid solar+battery DHW HP — Intelligent Flux - £33.16 use + £41.34 elec SC = £74.50 Boiler — Fixed + Agile elec - £27.25 gas + £26.99 gas SC + £45.98 elec SC = £100.23

100

Second Nature Systems @showpiece.bsky.social · 01/10/2026

Solar hot water: [179 Days | 5 Apr 26 to 30 Sep 26] 30 Sep: 5.03 kWh; since 5 Apr 469.6 kWh into tank. Modeled boiler gas input ~680.9 kWh; net input saved ~211.3 kWh. Modeled CO₂e avoided: ~1.43 kg on 30 Sep; ~133.5 kg since 5 Apr. ~31% less input, ~1.45x vs boiler model.

000

Second Nature Systems @showpiece.bsky.social · 30/09/2026

👍 Solar and battery lowered my gas demand for water heating (no heat pump yet) since I installed it about 3 months ago. To the point where its cheaper than a heat pump with no solar or battery 🙃

000

Second Nature Systems @showpiece.bsky.social · 30/09/2026

000

Second Nature Systems @showpiece.bsky.social · 30/09/2026

Heat Pump IDs compared to the Boiler today: 473

101

Second Nature Systems @showpiece.bsky.social · 30/09/2026

Cost, Energy & Comfort [180 Days | 3 Apr–29 Sep 26] HP £60.29 cheaper than modeled boiler without off-grid solar+battery DHW HP — Agile - £92.49 use + £89.97 elec SC = £182.46 Boiler — Tracker → Fixed + Tracker→Agile elec - £84.97 gas + £53.03 gas SC + £104.76 elec SC = £242.75

100

Second Nature Systems @showpiece.bsky.social · 30/09/2026

Solar hot water: [178 Days | 5 Apr 26 to 29 Sep 26] 29 Sep: 3.21 kWh; since 5 Apr 464.6 kWh into tank. Modeled boiler gas input ~673.6 kWh; net input saved ~209.1 kWh. Modeled CO₂e avoided: ~0.91 kg on 29 Sep; ~132.0 kg since 5 Apr. ~31% less input, ~1.45x vs boiler model.

000

Second Nature Systems @showpiece.bsky.social · 29/09/2026

000